Dispensing of prescription medication expiration dating
In general, pharmacists are obligated, through the DPRA, to monitor the expiry dates of drugs and natural health products, and to remove these from pharmacy stock.
While it may be useful for a consumer to know the expiry date related to their dispensed medication, there is no legal obligation for a pharmacist to add the expiry date on a prescription label.
Drugs prepared by addition of a solvent before dispensing or administration (such as suspensions of antibiotics for oral use or lyophilized drugs in vials for parenteral use) tend to be relatively unstable in the liquid state.
Suspensions are especially susceptible to freezing. With ophthalmic drugs, the limiting factor may not be the stability of the drug, but the continued ability of the preservative to inhibit microbial growth.
At the time of the medication expiry date, the drug must be at least 90% of the original potency under proper storage conditions.
The expiration date does not indicate a point when a medication loses potency and is no longer effective or becomes harmful.
This process is not in anyway spontaneous after the expiry date.
Expired drugs have not necessarily lost their potency and efficacy.
FDA regulations do not require manufacturers to determine actual long-term drug potency and stability.Injectable medications, which have become cloudy or discolored or show signs of precipitation should not be used.